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Old 10-06-2016, 11:14 PM   #1
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What is the funny black thing beside my Berkshire faucet rough-in? A vacuum break for

In a recent thread, I describe the installation of a Delta Tempassure shower faucet in my Berk 34QS. While installing the Delta Rough-in, I saw a pair of water pipes coming up to a black plastic unit beside the original rough-in.

The attached photo shows the original Berkshire 34QS shower rough-in with the extra plumbing with a black cap on top. The next photo shows the top of the cap, which says it is a B&B Model 571. It is only for use in an RV. In the background of the photo is my new Delta rough-in.

It is held by a plastic tie to the pipes coming into the shower rough-in. I believe that this is a vacuum break for the black tank flush on my Berk, and wonder if others can confirm that this is correct. This item is in the wall between the bedroom and bathroom of my Berk. The black tank flush inlet is on the outside of my Berk, approximately in line with this unit. And, I do think I heard it making a buzzing sound when I was flushing the black water tank.

I do notice that disconnecting the hose to my black water flush does result in a bunch of clean water coming back out of the connection, so I assume that the black unit I see is dividing the water that flushes into the tank from clean water that flows back out after flushing.

Am I right? Googling the part number suggests that I am right. But, I want to make sure I am right, since it affects winterizing and sanitation.
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Old 10-06-2016, 11:23 PM   #2
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You are right. The Vacuum breaker for the black flush.
Hope the snow stays in Regina!!
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Old 10-07-2016, 11:52 AM   #3
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B&B,
Thanks for the speedy confirmation. Is it your company that makes these? Pretty cool to have the manufacturer here.

The snow just started in Calgary within the last half hour. We got back from the mountains yesterday with some nice timing.

-Gordon
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Old 10-12-2016, 11:27 AM   #4
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Sorry. We are just Plain old Frog Members. I am Brian and DW is Bette. I just happen to know what that thing is.

Cheers
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2013 Rockwood 8289 Diamond Edition
GY D's/2.5 inch lift kit/Powerhouse 4 KW EFI Generator
2016 Ford F 350 Lariat Power Stroke Diesel Crew Cab FX4
2008 Golden Falcon 380PA Park Model Model

"Oh Canada,True North Strong and Free!"
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Old 10-12-2016, 03:19 PM   #5
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Nice to see that you are having a Canadian FROG rally. I'll have to look for it.
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